Stop for the oil engines of pumping systems



June 8 1926. 1,588,280

F. S. STRITE STOP FOR THE OIL ENGINES 0F PUMPING SYSTEMS Filed Feb. 27, 1926 2 Sheets-Sheet 1 [F 8 H kaSZ /"Z'Ze.

June 8 1926.

F. s. STRITE STOP FOR THE OIL ENGINES OF PUMPING SYSTEMS Filed Feb. 27, 1926 2 Sheets-Sheet 2 I (I 31mm 1 1 T01,- E rife GHQ: new

Patented .lune 8, 1926.

UNITED STATES 1,588,280 PATENT OFFICE.

mum: s. srmrn, or NEW YORK, N. Y.

STOP FOR THE OIL ENGINES OF PUM PING SYSTEMS.

Application filed February 27, 1926. Serial No. 91,274.

This invention relates to pumping systems I and more particularly to .a pumping system wherein the operating mechanism for the pumps is an oil engine of the Diesel type.

An important object of the invention is to provide novel and improved control mechanism for stopping the engine when a predetermined pressure has been generated by the pump.

A more specific object of the invention is to provide an operating mechanism of this kind which is operated from the pressure tank of the air starting mechanism for the Diesel engine and which acts to cut off the fuel supply to the cylinders of the engine.

These and other objects I attainby the construction shown in the accompanying drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein Figure 1 is a diagrammatic view of a pumping system constructed in accordance with my invention;

Figure 2 is a vertical sectional view through the control cylinder;

Figure 3 is an enlarged elevation of the re ulating valve;

igure 4 is a section on the line 4-4 of Figure 1.

Referring now more particularly to the drawings, the numeral 10 generally designates the cylinders of a Diesel engine. Fuel is fed to these cylinders from a supply tank 11 to a pressure line 12 in whichthe pressure is enerated by a pump 13 withdrawing the fuel from the tank 11. The pressure line 12 has branches 14 supplying fuel to each of the cylinders'and at its end remote from the pump 13 communicates with a return line 15 leading to the supply tank 11 through a valve 16 which opens in response to a predetermined pressure to permit the excess fuel oil to return In starting such engines, an air tank 17 is usually employed, thisair-tank containing air under high pressure which is admitted to the cylinders through a feed line 18 and suitable control mechanism (not herein disclosed). The numeral 19 generally designates a pump operated from the engine and 20 indicates a dischar e line of this pump. In order to contro speed of operation of the engine, a governor 21 is employed, the numeral 22 generally designating the governor operated shaft. This governor operated shaft is at present disclosed as connected to one end'of a lever 23 which is pivoted intermediate its ends and having its opposite end connected to the operating stem 24 of the valve 16. As the speed of the engine increases and arrives at a predetermined engine speed, the valve 16 starts to open, permitting the pressure generated by the pump to escape through the overflow pipe 15. Since the pressure under which the fuel is fed controls the amount of fuel which is injected in the cylinders, it will follow that the amount of fuel fed to the cylinders will be reduced and the s )eed of the engine accordingly reduced.

t will also be obvious that if the valve 16 be opened to the proper extent, the fuel, instea of bucking the pressure of the cylinders, will pass through the valve 16 and overflow 15 to return to the tank 11 so that no fuel will be fed and the Diesel engine will be stopped.

In accordance with my invention, I provide a cylinder 25 having one end 26 thereof open and the o posite end thereof provided with a stalling ox 27 through which ,is directed a stem 28 of a piston 29 operating within the cylinder. At the upper end of the cylinder is an inlet 30 and at a point spaced below this upper end a predetermined dlstance, the cylinder has formed in its wall a port 31, the purpose of which will herelnafter appear.

The outer end of the rod 28 has a pin and slot connection, as at 32, with the adjacent end of the valve lever 23, this pin and slot connection permitting an ordinary movement of the governor shaft under the influence of its governor element and accordingly permitting the governor controlled operation of the valve 16. The intake port 30 of this cylinder is connected with the air pressure cylinder 17 employed in starting the Diesel engine by a conduit 33 having arranged therein a valve 34, the valve element of which is normally stressed to closed position by a spring 35. This valve element is connected with a pressure regulator 36, the pressure of" which is derived from the exhaust line 20 of the pump through a conduit 37. The valve 34, spring 35, and regulator 36 constitute the usual regulator valve structure and form no part of my invention except in combination with the remaining elements of the structure. The conduit 33 is preferably provided between the valve 34 and the intake of the cylinder mined amount, the regulator valve 34 is' opened with the result that air from the container 17 is admitted to the cylinder 25, forcing the piston 29 thereof downwardly so that the governor shaft 22 is actuated and the valve 16 moved to its fully open posi-- tion through the governor connections. This relieves all back pressure against the fuel oil with the result that the feed of fuel oil to the cylinders is disconnected and the Diesel engine stopped.- The piston moves until the'port 31 is uncovered when the air pressure at opposite sides of the piston is Y alanced and movement thereof ceases. The

piston may be returned to its proper position by opening the pet cock 39- to ermit trapped air to bleed therefrom while the piston is being moved.

It will, of course, be obvious that the construction hereinbefore set forth is capable of a certain range of change and modification without materially departing from the spirit of the invention and I accordingly do not limit myself to such specific structure except as hereinafter claimed.

1. In control mechanism for preventing excessive pressure in the discharge lines of Diesel engine operated. pumps where the Diesel engine includes a pressure fuel feed and a control valve for regulatin the pressure of the fuel feed, a source of uid under pressure, a cylinder, a piston therein, a conduit connecting the source of pressure and the cylinder to admit pressure to the cylinder to move the piston in one direction therein, a normally closed valve controllin the passage of fluid pressure through sai conduit, a connection between the exhaust of the pump and the valve whereby the last named valve is open upon the formation of a predetermined pressure in the discharge of the pump and an operative connection between the piston of the cylinder and the ressure control valve of the Diesel engine uel feed line whereby the pressure of the Diesel engine includes a pressure fuel feed and a control valve for regulating the ressure of the fuel feed and further inclu es a source of fuel pressure for injection in its cylinders to start the engine, a cylinder, a piston therein, a conduit connecting the source of pressure and the cylinder to admit pressure to the cylinder to move the piston' in one direction therein, a normally closed valve controlling the passage of fluid pressure through said conduit, a connection between the exhaust of the pump and the valve whereby the last named valve is open upon the formation of a predetermined pressure in the discharge of the pump and an operative connection between the piston of the cylinder and the pressure control valve of the Dieselengine fuel feed line whereby the pressure of the fuel feed line is reduced below injection pressure when the piston is operated.

3; In control mechanism for preventing excessive pressure in the discharge lines of Diesel engine operated pumps where the Diesel engine includes a pressure fuel feed and a control valve for regulatin the pressure of the fuel feed, means ren' ered operative by a predetermined pressure in the discharge line of the pump for shifting said control valveto reduce the pressure of the J 'fuel feed.

4. In control mechanism for preventing excessive pressure n the discharge lines of Diesel engine operated pumps where the,

signature. 7

FRANK S. STRITE. 

